Flexible crushing-machine.



H. E. GREGG.

FLEXIBLE GRUSHING MACHINE.

APPLICATION FILED JAN.25, 1909.

Patented Nov. 30, 1909.

Fig.2.

ZUi tnesse s. 34%

Inventor. 2231/ Aiiidrney.

UNITED STATES PATENT OFFICE,

HARVEY E. GREGG, OF NEWPORT, DELAWARE.

FLEXIBLE CRUSHING-MIACHINE.

To all whom it may concern:

Be it known that I, T'IARVEY E. GREGG, a citizen of the United States,residing at Newport, in the county of Newcastle and State of Delaware,have invented certain new and useful Improvements in FlexibleUrushing-Vlachines, of which the following is a specification, referencebeing had to the accompanying drawings.

This invention relates to improvements in grinding or crushing machinesof that class having yieldable grinding elements, whereby foreignsubstances that are harder in structure that the substance or materialbeing operated upon, may pass out of the machine without being crushed.

One object of the invention is to provide a machine or mill of thischaracter having an improved grinding member or bur composed ofyieldably mounted sections which swing laterally toward and from theco-acting grinding member or bur.

A further object of the invention is to provide improved means forpreventing dust from reaching the bearing of the shaft of the rotarygrinding member or bur.

lVith the above and other objects in view, the invention consists of thenovel features of construction and the combination and arrangement ofparts hereinafter fully described and claimed, and illustrated in theaccompanying drawings, in which Figure l is a vertical section throughmy improved grinding or crushing machine; and Fi 2 is a top plan view,partly in horizontal section and with parts removed.

In the drawings A denotes a hollow main frame arranged on a base plateI) and provided with a vertical opening L through which the material tobe crushed passes and which contains the co-acting inner and outergrinding members or burs. The inner grinding member is preferably in theform of an externally corrugated cone B fixed to a vertical shaft Vhaving its lower end journaled in a step bearing U supported by spiderarms in the lower cylindrical tubular portion of the main frame A. Theupper end of the shaft is journaled in a suitable bearing in a tripodframe or spider F arranged upon and secured to the top of the frame A.The frame F is also provided with a bearing for a horizontal drive shaftS containing a pulley P for a driving belt and also supported in abearing on a stand- Specification of Letters Patent.

Application filed January 25, 1909.

Patented Nov. 30, 1909.

Serial No. 474,131.

I ard T which rises from the base plate D.

The beveled gearing G causes the rotary motion of the shaft S to beimparted to the shaft V.

The outer grinding member is in the form of a flexible cone-shapedcasing arranged in the upper portion of the main frame A and surroundingthe cone or bur B, and composed of an annular series of segmental cheekpieces 0 mounted for lateral movement toward and from the cone B. Saidcheek pieces 0 are preferably hung for swinging movement by ball andsocket hinge connections, each of which consists of a ball-like orspherical projection C formed on the center of the outer face of thecheek piece and seated in a substantially semispherical-shaped socket Eformed at the upper edge of the vertical opening in the main frame A, asclearly shown in the drawin This hinged mounting for the cheek piecespermits their lower portions to swing toward and from the cone or bur B,their inward swinging movement being limited by stop fingers orprojections N formed on the lower ends of the cheek pieces and adaptedto engage a portion of the main frame A, as shown in Fig. 1.

Coil springs I arranged within the main frame A in back of the cheekpieces actuate the latter inwardly to yieldably support them in anoperative position and, in order to permit the tension of said springsto be regulated to adapt the machine for operation upon different kindsof materials, set screws J are arranged in threaded openings in the mainframe A, as shown. Said set screws are adapted to be locked in anadjusted position by means of lock nuts K. The inner faces of the cheekpieces 0 may be smooth, corrugated, or of other form according to theuse for which the machine is designed and their side edges arepreferably beveled so as to overlap, as shown at Q in Fig. 2.

H denotes a bell-shaped hopper suitably secured to the top of the mainframe A within the spider or tripod frame F and adapted to directmaterial into the outer cone-shaped grinding member formed by the cheekpieces 0.

For the purpose of effectively preventing dust .of the material beingcrushed by the machine, from entering the step bearing U, the lower endof the cone B is formed with a depending annular flange W whichsurrounds the upper end of said step bearing. Within the flange isformed a plurality of inwardly and radially projecting ribs R which formblades or vanes to create a current of air atthe top of the bearing Ufor the purpose of directing the dust away from the latter. This annularseries of ribs or vanes R are so disposed in the flange or ring W thatwhen the shaft V is rapidly rotated they will create a current of airwhich will effectively keep the dust out of the step bear M denotes anopen metal cylinder which forms a surrounding casing for the body A andby means of which the latter is secured upon the base plate D.

While the preferred embodiment of the invention has been shown anddescribed in detail, it will be understood that various changes in theform, proportion and arrangement of parts and the details ofconstrnetion may be resorted to within the spirit and scope of theinvention.

Having thus described the invention what is claimed is:

In a crushing machine, the combination of a hollow cylindrical body, ashaft arranged vertically therein a step bearing for the lower end ofthe shaft and arranged in said body said step bearing having acylindrical upper end, an annular series of Segmental cheek piecesmounted for swinging movement in the body above said bearing, acone-shaped crushing member to co-act with said cheek pieces fixed tothe shaft above said step bearing, an annular flange formed integralwith the bottom of said cone-shaped crushing member and dependingtherefrom to receive the cylindrical upper end of the step bearing, saiddepending flange being formed upon its inner wall with inwardlyprojecting radial ribs to provide vanes which create a current of airwhen the shaft is rotated and direct dust away from the upper end of thestep bearing, and means for rotating said shaft.

In testimony whereof I hereunto afiix my signature in the presence oftwo witnesses.

HARVEY E. GREGG. \Vitnesses MARY B. REED, FRANCIS H. HoFrEoKER.

